POST UTME RHEMA UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas expands from an initial volume of 2 L to a final volume of 5 L against an external pressure of 1 atm. What is the work done by the gas?
A. 10 J
B. 20 J
C. 30 J
D. 40 J
Question 2
A 100 V battery is connected to a 10 Ω resistor and a 20 Ω resistor in parallel. What is the current drawn from the battery?
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 3
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle experiences a centripetal acceleration of 2 m/s^2, what is the magnitude of the net force acting on it?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 4
A 1000 W, 200 V AC supply is connected to a 50 Ω resistor. Calculate the power factor of the circuit.
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 5
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, determine the maximum velocity of the particle.
A. 0.2 m/s
B. 0.4 m/s
C. 0.6 m/s
D. 0.8 m/s
Question 6
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the change in its kinetic energy?
A. 50 J
B. 100 J
C. 150 J
D. 200 J
Question 7
A vector A has a magnitude of 5 units and makes an angle of 30° with the x-axis. If the vector B has a magnitude of 3 units and makes an angle of 60° with the x-axis, what is the magnitude of the resul\tant vector A + B?
A. 4 units
B. 5 units
C. 6 units
D. 7 units
Question 8
A radioactive sample decays from 100 g to 50 g in 10 days. If the half-life of the sample is 5 days, what is the decay cons\tant?
A. 0.14 day^-1
B. 0.17 day^-1
C. 0.21 day^-1
D. 0.25 day^-1
Question 9
A magnetic field of 0.5 T is applied to a coil of 100 turns and radius 0.1 m. If the coil is rotated by 90°, what is the induced emf?
A. 0.1
B. 0.5
C. 1.0
D. 2.0
Question 10
A light source is placed 2 m away from a convex lens with a focal length of 0.5 m. If the image dis\tance is 1.5 m, determine the magnification of the lens.
A. -2
B. -1
C. 1
D. 2
Question 11
A 200 V, 50 Hz AC supply is connected to a 100 Ω resistor. Calculate the rms current flowing through the resistor.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 12
A thermodynamic system undergoes a process from state A to state B. If the system absorbs 100 J of heat and does 50 J of work, what is the change in internal energy of the system?
A. 50 J
B. 100 J
C. 150 J
D. 200 J
Question 13
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the resulting frequency?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 14
A light source emits a beam of light with a wavelength of 500 nm. If the beam is incident on a dif\fraction grating with 1000 lines/mm, what is the angle of dif\fraction?
A. 30°
B. 45°
C. 60°
D. 90°
Question 15
A particle of mass 2 kg is moving in a circular path of radius 4 m with a cons\tant speed of 6 m/s. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 8 m/s^2
B. 12 m/s^2
C. 16 m/s^2
D. 24 m/s^2

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